diff --git a/.github/workflows/go-version.yml b/.github/workflows/go-version.yml
index 7946ef046..281c09f25 100644
--- a/.github/workflows/go-version.yml
+++ b/.github/workflows/go-version.yml
@@ -3,7 +3,7 @@ name: Go version
 on:
   push:
     branches:
-      - master
+      - main
     paths:
       - Dockerfile
 
diff --git a/.github/workflows/node-version.yml b/.github/workflows/node-version.yml
index d9e883f67..28770f66f 100644
--- a/.github/workflows/node-version.yml
+++ b/.github/workflows/node-version.yml
@@ -3,7 +3,7 @@ name: Node version
 on:
   push:
     branches:
-      - master
+      - main
     paths:
       - Dockerfile
 
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index bc496902f..e05d0fb77 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -3,10 +3,10 @@ name: Test
 on:
   push:
     branches:
-      - master
+      - main
   pull_request:
     branches:
-      - master
+      - main
   release:
     types:
       - published
@@ -34,7 +34,7 @@ jobs:
           path: ~/go/pkg/mod
           key: ${{ runner.os }}-${{ env.GITHUB_REF_SLUG }}-go-modules-${{ hashFiles('**/go.sum') }}
           restore-keys: |
-            ${{ runner.os }}-master-go-modules-
+            ${{ runner.os }}-main-go-modules-
 
       - name: Fetch all Go modules
         if: steps.cache-go-modules.outputs.cache-hit != 'true'
@@ -73,7 +73,7 @@ jobs:
           path: ~/go/pkg/mod
           key: ${{ runner.os }}-${{ env.GITHUB_REF_SLUG }}-go-modules-${{ hashFiles('**/go.sum') }}
           restore-keys: |
-            ${{ runner.os }}-master-go-modules-
+            ${{ runner.os }}-main-go-modules-
 
       - name: Fetch all Go modules
         if: steps.cache-go-modules.outputs.cache-hit != 'true'
@@ -112,7 +112,7 @@ jobs:
           path: ~/.npm
           key: ${{ runner.os }}-${{ env.GITHUB_REF_SLUG }}-npm-${{ hashFiles('**/package-lock.json') }}
           restore-keys: |
-            ${{ runner.os }}-master-npm-
+            ${{ runner.os }}-main-npm-
 
       - name: Fetch all NPM dependencies
         if: steps.cache-npm.outputs.cache-hit != 'true'
@@ -150,7 +150,7 @@ jobs:
           path: ~/.npm
           key: ${{ runner.os }}-${{ env.GITHUB_REF_SLUG }}-npm-${{ hashFiles('**/package-lock.json') }}
           restore-keys: |
-            ${{ runner.os }}-master-npm-
+            ${{ runner.os }}-main-npm-
 
       - name: Fetch all NPM dependencies
         if: steps.cache-npm.outputs.cache-hit != 'true'
@@ -199,7 +199,7 @@ jobs:
           path: ~/.npm
           key: ${{ runner.os }}-${{ env.GITHUB_REF_SLUG }}-npm-${{ hashFiles('**/package-lock.json') }}
           restore-keys: |
-            ${{ runner.os }}-master-npm-
+            ${{ runner.os }}-main-npm-
 
       - name: Fetch all NPM dependencies
         if: steps.cache-npm.outputs.cache-hit != 'true'
@@ -278,7 +278,7 @@ jobs:
           path: ~/.npm
           key: ${{ runner.os }}-${{ env.GITHUB_REF_SLUG }}-npm-${{ hashFiles('**/package-lock.json') }}
           restore-keys: |
-            ${{ runner.os }}-master-npm-
+            ${{ runner.os }}-main-npm-
 
       - name: Fetch all NPM dependencies
         if: steps.cache-npm.outputs.cache-hit != 'true'
@@ -390,7 +390,7 @@ jobs:
           path: ~/go/pkg/mod
           key: ${{ runner.os }}-${{ env.GITHUB_REF_SLUG }}-go-modules-${{ hashFiles('**/go.sum') }}
           restore-keys: |
-            ${{ runner.os }}-master-go-modules-
+            ${{ runner.os }}-main-go-modules-
 
       - name: Fetch all Go modules
         if: steps.cache-go-modules.outputs.cache-hit != 'true'
@@ -439,7 +439,7 @@ jobs:
           path: ~/.npm
           key: ${{ runner.os }}-${{ env.GITHUB_REF_SLUG }}-npm-${{ hashFiles('**/package-lock.json') }}
           restore-keys: |
-            ${{ runner.os }}-master-npm-
+            ${{ runner.os }}-main-npm-
 
       - name: Fetch all NPM dependencies
         if: steps.cache-npm.outputs.cache-hit != 'true'
@@ -486,7 +486,7 @@ jobs:
           path: ~/.npm
           key: ${{ runner.os }}-${{ env.GITHUB_REF_SLUG }}-npm-${{ hashFiles('**/package-lock.json') }}
           restore-keys: |
-            ${{ runner.os }}-master-npm-
+            ${{ runner.os }}-main-npm-
 
       - name: Fetch all NPM dependencies
         if: steps.cache-npm.outputs.cache-hit != 'true'
@@ -531,7 +531,7 @@ jobs:
             ~/.npm
           key: ${{ runner.os }}-${{ env.GITHUB_REF_SLUG }}-go-cc-${{ hashFiles('**/go.sum') }}
           restore-keys: |
-            ${{ runner.os }}-master-go-cc-
+            ${{ runner.os }}-main-go-cc-
 
       - name: Cross compile binaries
         run: make crosscompile -j 2
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 813481fd5..ed41b7593 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -8,7 +8,7 @@ file.
 ## Git tags and branches
 
 Every release tag name will follow `vX.Y.Z` naming scheme, example: `v0.1.0`.
-All releases are tagged against the `master` branch.
+All releases are tagged against the `main` branch.
 
 ## Commit messages
 
diff --git a/README.md b/README.md
index c8e5ee9b4..5d37c2283 100644
--- a/README.md
+++ b/README.md
@@ -130,7 +130,7 @@ media queries.
 
 ## Demo
 
-[Online demo](https://karma-demo.herokuapp.com/) is running latest master branch
+[Online demo](https://karma-demo.herokuapp.com/) is running latest main branch
 or PR branch version. It might include features that are experimental and not
 yet ready to be included.
 
@@ -243,7 +243,7 @@ Official docker images are built and hosted on
 Images are built automatically for:
 
 - release tags in git - `ghcr.io/prymitive/karma:vX.Y.Z`
-- master branch commits - `ghcr.io/prymitive/karma:latest`
+- main branch commits - `ghcr.io/prymitive/karma:latest`
 
 #### Examples
 
@@ -254,11 +254,11 @@ To start a release image run:
 Latest release details can be found on
 [GitHub](https://github.com/prymitive/karma/releases).
 
-To start docker image build from lastet master branch run:
+To start docker image build from lastet main branch run:
 
     docker run -e ALERTMANAGER_URI=https://alertmanager.example.com ghcr.io/prymitive/karma:latest
 
-Note that latest master branch might have bugs or breaking changes. Using
+Note that latest main branch might have bugs or breaking changes. Using
 release images is strongly recommended for any production use.
 
 ### Building a Docker image
diff --git a/make/go.mk b/make/go.mk
index 61294a8f1..4d35d765a 100644
--- a/make/go.mk
+++ b/make/go.mk
@@ -36,7 +36,7 @@ benchmark-go:
 $(GOBIN)/benchstat: tools/benchstat/go.mod tools/benchstat/go.sum
 	@$(GO) install -modfile=tools/benchstat/go.mod golang.org/x/perf/cmd/benchstat
 benchmark-compare-go: $(GOBIN)/benchstat
-	@$(GOBIN)/benchstat master.txt new.txt
+	@$(GOBIN)/benchstat main.txt new.txt
 
 $(GOBIN)/looppointer: tools/looppointer/go.mod tools/looppointer/go.sum
 	$(GO) install -modfile=tools/looppointer/go.mod github.com/kyoh86/looppointer/cmd/looppointer
diff --git a/scripts/ci-diff-benchmark-go.sh b/scripts/ci-diff-benchmark-go.sh
index 04ba41e17..681c6eaa8 100755
--- a/scripts/ci-diff-benchmark-go.sh
+++ b/scripts/ci-diff-benchmark-go.sh
@@ -3,10 +3,10 @@
 set -o errexit
 set -o pipefail
 
-git fetch origin master
+git fetch origin main
 git reset --hard FETCH_HEAD
 
-make benchmark-go | tee master.txt
+make benchmark-go | tee main.txt
 
 git reset --hard ${GITHUB_SHA}
 make benchmark-go | tee new.txt
diff --git a/scripts/ci-diff-webpack.sh b/scripts/ci-diff-webpack.sh
index 633fbeeca..61f5a0a08 100755
--- a/scripts/ci-diff-webpack.sh
+++ b/scripts/ci-diff-webpack.sh
@@ -3,15 +3,15 @@
 set -o errexit
 set -o pipefail
 
-git fetch origin master
+git fetch origin main
 git reset --hard FETCH_HEAD
 
 make -C ui build/stats.json
-mv ui/build/stats.json master.json
+mv ui/build/stats.json main.json
 
 make clean
 git reset --hard ${GITHUB_SHA}
 make -C ui build/stats.json
 
-./scripts/cra-bundle-stats-diff.py master.json ui/build/stats.json | tee diff.html
+./scripts/cra-bundle-stats-diff.py main.json ui/build/stats.json | tee diff.html
 ./scripts/pr-comment.py "Webpack bundle size diff" diff.html html